Available for freelance & full-time opportunities

Hi, I'm Sadda Hussain Butt

Senior Android Developer • 8+ Years Experience

Building secure, scalable, and delightful Android applications across B2B, B2C, and C2C domains. From AI-powered wellness apps to hardware-integrated self-service kiosks — I deliver production-ready mobile experiences.

Sialkot, Pakistan (Remote Friendly)
+92 322 7036979
saddabutt@gmail.com
📱

Android Expert

Kotlin • Jetpack • AI

About Me

I'm an Android developer with 8 years of hands-on experience building mobile applications from concept to Play Store release. I specialize in creating secure, scalable, and user-friendly solutions across B2B, B2C, and C2C domains — including booking platforms, healthcare, VPN, virtual fitness, service marketplaces, and advanced hardware-integrated self-service kiosks.

Currently working as a Top Rated Freelance Android Engineer on Upwork (100% Job Success), I recently delivered a robust kiosk system for electronics buyback with secure serial communication, barcode scanning, and real-time REST API integration.

Passionate about clean architecture, modern Kotlin, and integrating cutting-edge AI (OpenAI GPT-4o Mini & Groq LLaMA) to deliver delightful user experiences.

Experience

April 2025 — Present

Freelance Android Engineer

Upwork • Remote

Top Rated • 100% Job Success
  • Developed a robust Kiosk-Based Android System for Electronics Buyback (Self-Service)
  • Engineered secure serial communication with ENQ/ACK, CRC checks, and cassette status parsing
  • Implemented barcode scanning, receipt lookup, and transaction validation via RESTful APIs
  • Built a mobile diagnostic app to assess device health for resale and trade-in
May 2019 — March 2025

Senior Lead Android Developer

Xenex Media • Remote, Australia

Led team of 10+ developers • 10+ Android apps shipped

Flagship Project

myWellB — AI-Powered Personalized Wellness App

  • Kotlin, MVVM, Jetpack, Firebase
  • OpenAI GPT-4o Mini & Groq LLaMA 3.1
  • AES encryption, Biometric Auth & 2FA
  • Stripe payments with automated receipts
  • Dynamic white-label UI + localization
Oct 2018 — Apr 2019

Android Developer

Upgenics International • Lahore, Pakistan

Contributed to PhoneCheck, a patent-pending mobile diagnostic app performing 60+ automated hardware/software checks.
Oct 2017 — Oct 2018

Android Developer

AppsGenii Technologies • Lahore, Pakistan

Developed features for LaVoice (polling app) and ShareNGo (peer-to-peer finance sharing).

Featured Projects

myWellB — AI-Powered Wellness App

Flagship Project • Xenex Media

AI coaching, biometric security, Stripe payments, multi-language support.

Electronics Buyback Kiosk System

Hardware Integration

Self-service kiosk with secure serial communication, barcode scanning & real-time API integration.

BoroMe – Lending & Borrowing Platform

1,500+ users • Peer-to-peer finance

RealGiving – Location-based Deal Finder

1,000+ users • 50+ partners

FreshFeelz – Health & Beauty Booking

2,000+ users • $78k+ in bookings

GoCycle – Virtual Cycling App

2,000+ users • 6,000+ rides logged

Skills & Tools

Languages & IDE

Kotlin Java Android Studio Gradle (Kotlin DSL)

Architecture

MVVM Clean Architecture SOLID Principles Modularization

Frameworks & Libraries

Jetpack Compose Hilt / Dagger Retrofit Coroutines & Flow Firebase

UI/UX & Design

Material Design 3 Figma Custom Views

Integrations

Stripe • PayPal Google Maps • Mapbox AES Encryption • Biometrics

Project Management

Git • GitHub Jira • Scrum

Education

Bachelor of Science, Software Engineering

University of Gujrat • 2013 — 2017

Grade: A+

Major: Mobile App Development, Computer System Security
Activities: IEEE Student Ambassador, Pakistan

Let's build something amazing together

Whether you need a new Android app, a kiosk system, AI integration, or just want to discuss mobile technology — I'm all ears.

This portfolio was made with

❤️   Kotlin   Tailwind   Grok

Styled to match the professional aesthetic of OneBit Technologies.
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